[#RSA_pkey_ctx_ctrl]
= RSA_pkey_ctx_ctrl
:mrdocs:

Dispatch an RSA‐specific control operation on an EVP_PKEY_CTX.

== Synopsis

Declared in `<openssl/rsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
RSA_pkey_ctx_ctrl(
    xref:EVP_PKEY_CTX.adoc[EVP_PKEY_CTX]* ctx,
    int optype,
    int cmd,
    int p1,
    void* p2);
----

== Return Value

Positive on success, or a non‐positive value on failure / unsupported command.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Key context that must be for an RSA algorithm.
| *optype*
| Operation type mask (for example EVP_PKEY_OP_TYPE_SIG) or ‐1 for any.
| *cmd*
| Control command such as EVP_PKEY_CTRL_RSA_PADDING.
| *p1*
| Integer argument for `cmd.`
| *p2*
| Pointer argument for `cmd,` or NULL when unused.
|===


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